Hoisting device for elevated carriers.



A. W. KNUTSON.

HOISTING DEVICE FUR ELEVATED CARRIERS.

AFPLecATloM min Nov. 2, 1911.

Patented Mar. 11, 19179.

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fr. 2% A iinrrnn srArns rATeN'r onrion.

ALFRED W. KNu'rsON, or eALEsBUne, ILLINOIS, AssIGNon To nown MANUFACTURING co., or eALnsBUne, ILLINOIS, A CORPORATION or ILLINOIS.

HOISIING DEVICE FOR ELEVATED CARRIERS;

messia.

To all whom t may concern:

Be it known that I, ALFRED W. KNUTSON, a citizen of the United States, and a resident of Galesburg, in the county of Knox and State of Illinois, have invented a new and useful Hoisting Device for Elevated Oarriers, of which the following is a speciication. Y

My invention relates to chain or cableoperated Overheady "carriers, such as litter carriers, and particularly to means for raising and lowering the receptacle or carrier common in devices of this nature, and it consists, substantially, Vin herein disclosed.

One of the objects of the invention is to provide novel take-up devices foral portion of the chain. 'Y e Another object is to provide a yielding take-up mechanism.

the improvements partly: broken away and partly in section Fig. '3, a side elevation of' a litter carr1er in which are embodied my improvements, the receptacle shown in substantially its lowermost position; Yand the chain-guideshoe or guard-shoe.

Considering the drawings in detail, 2 de-V notes a suitably supported elevated track upon which roll the Wheels 3 of carrlages 4.

5 designates an Ordinary type of receptacle swung between sustaining-arms' each of which is connected to and hung from a chain 7 Y 8 indicates an endless Operating-chain embracing a drive-chain-wheel 9 xed on a shaft 20 journaled in bearings 12, 12 in spaced pairs of arms 13, 14, respectively, de-

pending from the carriages 4. 15, 15 de# note a pair of supporting and guiding plates spaced a slight distance apart and Fig. 4, an enlarged perspective detail OIY Specification of Letters'atent. 'Pagntd N131; 11, 1919.

Application inea November 2, 1917. serial No. 199,870.

their ends secured to the arms 13 and 14. V16 designates a split wheel of the combined pin and sprocket type, journaled on an axle 17 mounted in bearin 's in the 4plate 15, and 18 designates a like w ieel journaled on an axle 19 mounted in bearings in said plates..

Worms 20 on the shaft 10 engage the pins 21 of said wheels to'rotate them in the usual manner. The hereinbefore described Vparts are'fully described in United States Letters Patent No. 1,239,110, granted to me September 4, 1916.

V21 denotes a contractile spring disposed between the plates 15, 15 and substantially Y midlength thereof. The linea-a, Fig, 1,V 1ndicates the midlength of said plates. Y Each end of said spring engages a cross-bar 22 which connects the inner ends of a pair of arms which Vform a yoke 23. In the relatively outer end of'eaoh yoke is rotatably mounted a sheave 24, its axle beingV` desig=v nated by 25. Each of these sheaves is preferably formed on its opposed faceswith chainfguides 26. The ends of the axle 25 project beyond the yoke members, and on each ofV these projectingV ends is secured a clip 27 which slides on the adjacent plates 15 or 15 as the. case may be.

28, 28 denote chain-guide shoes each of which is pivoted, by means of a pin 29 passing through apertures 30 in the ears 31 of the shoe, between theplates 15, 15. Each shoe has at its inner end a mouth 32 and its forward end constitutes arnose 33 substan-` tially V-shaped in crossesection and s ubstalntially concentric with the hub 34 of the sprocket-wheel 16. On each pin 29 is rotatably mounted a sheave 35.

One (which I may term theV outer) end of feachfchain 7 is, Yas above stated, secured to one of the receptacle-sustaining arms 6.

the teeth oit' the sprooket-wheel 16, passing beneath the nose 33, thence throughV the Vmouth 32, thence embracing the adjacent Y The chain passes thence over and engages of the spaced cheeks comprising the hoisting-wheels 16 and 18 to thereby rotate them and cause their sprocket-teeth to engage and draw upward the links of the chains 7".' In so doing, the operator is assisted by the stored energy of the expanded spring 2l whichin contracting to its normal posit-ion ig. 1)'draws upon both yokes 23Y and thus upon both chains 7. It. is to'be observed,

therefore, that to this extent at least the act of retrieving-orelevating the. receptacle is automatic. During theupward progress of the receptaclev4 the spring will, through they instrumentality of the; yokesQS and the pulleysVK 24 andy 35 aidedv somewhat by the sprocket-teeth 36 and' mouthl 32,v automatically take: up aV large `portion of the chai-ns 7 ,i suiiicient, inl fact, to prevent Yany part; of the lattery from falling. 'intel the receptacle' 6 or bein-g-inthew-a'yE of the operator. The shoes 2S'are'solocated that one ofthe worms Y turns freely in the concaved' terminal' of each. Y

Now assumes the parts to bein the relative positions shownin ligf.` l. To lower the re-V extremes ofn motion, the/operator; may accomplish this by merelyl stopping' the chainf Sor evenl by placingihis,hand-beneath the receptacle and exertinga,E slight upward pressure; thcreomtfhe; spring acting as an equal# izing and lstabilizingiagent.

Hereinafter the receptacle 5 loa-d.

is termed a I claim as my invention the following, to- Wit; Y Y

l.` In a hoisting-device, a load, a pair of hoisting-chains secured to opposite ends of t-he load, a-spring connecting adjacent ends 0i' said chains, and means for applying power to the chains. y y e 2. Ina hoisting-device, a load', a hoistingchain for raising and lowering it, a sliding sheave for taking up a portion of the chain, and a spring for moving said vsheave in one direction;

3. In a'hoistinG-device, a load, a hoisting-V cha-in for raisingV and: lowering it, a sliding sheave forl taking up one; of* theV portions ot the chain and aspring for automatically moving said sheaye'- in one direction.

4t. In a hoisting-device, a load, a hoistingchaint'or raising f and' lowering` it, a sliding take-up, and a spring for rautomatiically moving the take-up in' oneI direction. y f

5. In a' hoistingf-device, a load, hoisting-v chains each secured at one of its ends thereto,

a way,.a pair of take-up sheaves slidablev in said way, a yielding connection between said Y sheaves', and'nieans for connecting each of said chains with. one ofy thesheaves.

G. In a hoisting-device, a load, hoistingcha-ins; each seouredat one? otite-ends thereto, a pair of take-up elements-away in whichy they's-lide, means for connecting each of them with they other end of one of said chains, Y and: aspring connecting, said take-up elements. Y

7 In a hoisting-device, a lead, a hoisting.u chaiiry connected therewith, a sprocket-wheel for drivingiit, means for driving the sprocket-wheel, a guide-shoe havinga-,nose substantially concentricv with the sprocket` wheel and overlying the chain, said shoe havingV also amouth through v'which the chain passes, a slidable shea-ve over which the chain passes, ,a non-slidable sheave over which it also gasses, and mean-s for se- Y curingfthat end of the chain` whichY is dis, tant-freni the load. f

ALFRED IV, KN-UTSON.

Gomes-of' this-patentfmay beobtainedfor five/cents each, by addressing thel Commissioner offPatents, Washington, DfCJ 

